ABSTRACT
Rickets in the growing child or adolescent and osteomalacia in the adult develop in
a variety of clinical situations and have in common an absence or delay in the mineralization
of growth cartilage and in newly formed bone collagen. Classically, deficiency of
vitamin D, which is essential for the absorption of dietary calcium, has been the
major cause. However, rickets is also seen as a result of hereditary defects in critical
vitamin D signaling molecules. Disturbances of phosphate metabolism can also lead
to signs of rickets and osteomalacia, notably X-linked hypophosphatemic rickets, and
oncogenic osteomalacia. Extrarenal synthesis of 1,25-dihydroxyvitamin D, such as that
associated with granulomatous disease, can also lead to disturbances in calcium metabolism,
with associated skeletal and nonskeletal changes.
KEYWORD
Vitamin D - rickets - osteomalacia - X-linked hypophosphatemic rickets - oncogenic
osteomalacia